[BE] Delete non-existing labels

[malfet]

Stack from ghstack (oldest at bottom):

• [1/N] Remove MacOS-13 MPS testing #159278
• -> [BE] Delete non-existing labels #159277

As no such runners has been online for last 2+ month

[pytorch-bot]

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As of commit 3170ccb with merge base 1abff80 ():
💚 Looks good so far! There are no failures yet. 💚

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• ⏳ pull / linux-jammy-py3_9-clang9-xla / test (xla, 1, 1, linux.12xlarge, unstable) (gh) (#158876)

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[malfet]

@pytorchbot merge -f "Lint is green"

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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